When a fat girl gives you really bad head. She couldn't suck dick to save her own life. You then have to finish yourself off. The girl then decides to make up for the terrible blowjob by licking up your cum. Usually the girl uses the phrase "Do you want me to clean that up?" to try to gain your affection.

How did you go with that chick last night?

Ohhh. It was terrible. She gives the worst head. I ended up finishing myself off. Then she just licked up all my cum. She was a total cum guzzler.